/Engine/Source/Runtime/InteractiveToolsFramework/Public/BaseGizmos/TransformProxy.h
This delegate is fired whenBeginTransformEditSequence()is called to indicate that a sequence of pivot updates has started
typedef TMulticastDelegate_OneParam< void, [UTransformProxy](API\Runtime\InteractiveToolsFramework\BaseGizmos\UTransformProxy) * > FOnBeginPivotEdit